A quantitative measure for the uniformity of fixation density: The Voronoi method |
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Authors: | Eelco A B Over Ignace T C Hooge Casper J Erkelens |
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Institution: | (1) Psychology, Malet Street, Birkbeck, University of London, London, WC1E 7HX, U.K.;(2) Department of Psychology, University of South Carolina, Barnwell, Room 237-B, Columbia, South Carolina, USA |
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Abstract: | In order to characterize the uniformity of fixation density, we propose a quantitative measure based on Voronoi diagrams,
in which cells are defined around fixation locations. We examined how normalized cell size distributions are related to homogeneous
and inhomogeneous fixation densities. Two possible measures for use with the Voronoi method are discussed. Both show good
correlation with subjective visual evaluations of the uniformity of fixation densities. Not only are these measures objective
and quantitative, they also have a simple intuitive meaning: They may be thought of as reflecting the clustering of fixations. |
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